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From some spot-checking, it looks like it's minority usage, but not too rare. Looking at the top 10 or so stories that come up with https://www.google.com/sear

• koralatov 13y ago
  The Wikipedia's page on it has an interesting origin[1]: The Oxford English Dictionary has published references going back to 1718 for “perfect storm,” though the earliest citations use the phrase positively, as in a “perfect storm” of applause. It also notes that the phrase, is nearly synonymous with "worst-case scenario," although the latter carries more of a hypothetical connotation. The phrase is relatively rare in normal British English usage, and it's usually used in the ``worst-case scenario'' sense. To me, the word `storm' brings with it a negative connotation, but I suppose it's logical enough, albeit a little strange, that it could be used to describe a positive set of circumstances. [1]: http://en.wikipedia.org/wiki/Perfect_storm http://en.wikipedia.org/wiki/Perfect_storm